After right clicking a horse with the lead, the lead disappears as it normally would, then when you try to right click (empty handed, exactly where the lead was) a fence to attach it, it doesn't attach there. Now, if you have 2 leads it does everything normally.
23rd Duplicate of MC-13754, please use the search function to see if your bug has already been submitted. Currently over 57% of tickets are being closed as duplicate.